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? 1:16
https://www.youtube.com/watch?v=B997gX07hW4
May 6, 2008 - Uploaded by Mark Peterson
A certified Fitness Specialist by the cooper clinic in Dallas, and a personal trainer for the first 16 years of my fitness career. .... I purchased a used Golds Gym Treadmill model# GGTL396100 which I tested when buying ... The treadmill will fully incline thennot go down, I have tried to recalibrate the incline ..

Step 1

Plug the power cord into a
UL 1449 single-outlet surge suppressor and then plug the surge
suppressor into an electrical outlet that is not GFCI-equipped if the
power does not turn on. If the treadmill is plugged in and the power
still does not work, make sure the key is in the console and that the
Reset/Off circuit breaker has not been tripped. Press the switch to
"Reset" if it has been tripped.

Step 2

Check the Reset/Off circuit
breaker if the power switches off while in use. Wait five minutes and
switch the button to reset. Check that the power cord is still plugged
in securely; pull the plug out and plug it back in after five minutes.
Pull out the console key and reinsert to see if the machine will turn
back on.

Step 3

Place the chest pulse
sensor tightly right underneath your pectoral muscles or breasts for it
to operate properly. Position it lower or higher on your chest if it
does not work properly. Wet the electrodes with a saline solution. Walk
near the walking belt's center within an arm's reach of the console.

Step 4

Remove the console key and
unplug the treadmill to loosen the walking belt if it slows when in use.
Turn the rear roller bolts counterclockwise with the hex key 1/4 of a
turn until you can lift the walking belt's edges 3 to 4 inches from the
platform.

Step 5

Remove the key and unplug
the treadmill to adjust the walking belt if it is off-center or slips
when in use. Loosen the rear roller bolts with the hex key and
reposition the walking belt. Tighten the roller bolts. Walk on the
treadmill to determine if the walking belt is centered. If not, loosen
the roller bolts again and make adjustments until the walking belt is
centered.

Step 6

Recalibrate the incline
system if the treadmill's incline does not adjust correctly. Press the
"Incline" button and remove the console key. Wait a few seconds and
replace the console key. The incline will automatically recalibrate by
moving to the maximum incline level and then the minimum level.

Step 7

Press the "Stop" button for
a few seconds to turn off the demo mode if the console display stays
lit after you remove the console key.

you may have a faulty board.Does it have a light on it when you turn it on. If not it is faulty or the power lead is faulty or safety switch is faulty.
If all else fails call a tech to come out and look at it for you.